The lowpas filter has a non-inverting butterworth response and is made in CMOS technology. It uses a switched capacitor filter implementation. No external components are necessary to set the filter characteristics. The cutoff frequency of the lowpass filter is selectable based on the clock frequency. Either an external clock or the on-chip oscillator can be used. Included in the integrated circuit are two op amps which can be configured by the user.

The clock to cutoff frequency ratio can be selected at either 50:1 or 100:1 by using the Clock to Corner Select pin. A current-saving power down mode can be chosen with the Poser select pin. In the low power mode the maximum corner frequency is 5 kHz. In regular operation the maximum corner frequency is 20 kHz.


  • No response setting resistors needed
  • Switched Capacitor Filters
  • 3.3 or 5 Volts Operation
  • Operates from internal or external clock
  • Includes two uncommitted op amps
  • Power down mode
  • Selectable clock to corner frequency ratio


  • Two Way Radio
  • Telecommunications
  • Data Communications
  • Anti-Alias Filters
  • General Purpose Low-Pass Filters